Posted by Roger Link on July 13, 2000 at 04:52:39:
In Reply to: Re: Intermittent Low Water Level posted by BC Lee on July 12, 2000 at 19:26:59:
: Thanks for the detailed suggestions. More on the low water level.
: We have checked the feed pumps and they were OK. In fact, one of the units is a new one. We have checked the steam traps, other than one or two bad ones, the rest are OK, although recently we have observed high "vapour blow off" apparent from the "white smoke". The condensate has been at 94 deg C for some times. The load is also normal. Strainer and feedpump line were checked and were found to be OK.
: We have paired the small boiler (2500 KG) and the larger one (4800 KG) running at the same time, the LWCO did not happend as often as when we paired two large units together (both 4800 Kg).
: Pls advice. Thank you.
You have a very puzzling situation! Can you describe the method by which the boiler feedpump line is piped. Is there a common pump and line feeding both boilers or seperate pumps and lines? Also, do you have an in-line control valve that modulates to allow make-up to the boiler or an on/off control with the pump controled by the water level controller? Have you eliminated the water level controller and LWCO as being defective?
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